Also known as rubber processing plant. A factory that processes latex to produce concentrated latex or latex and cement blocks to produce primary products such as dry rubber. Because latex contains a lot of water, a little sugar and protein, it is easy to rot and deteriorate, but the quality of impurities such as gel blocks and mixed rubber is uneven, which is not convenient for storage and trading. Therefore, a primary processing plant with curing, granulation (chopping), soaking, drying, centrifugation and other facilities is generally built in or near its place of origin to remove moisture and impurities in raw materials such as latex, rubber blocks and rubber compounds, and make cigarette gum with relatively stable and consistent quality.